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MIC4576-3.3WT Datasheet(PDF) 1 Page - Micrel Semiconductor |
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MIC4576-3.3WT Datasheet(HTML) 1 Page - Micrel Semiconductor |
1 / 8 page March 2006 1 MIC4576 MIC4576 Micrel, Inc. MIC4576 200kHz Simple 3A Buck Regulator General Description The MIC4576 is a series of easy to use fixed and adjustable BiCMOS step-down (buck) switch-mode voltage regulators. The 200kHz MIC4576 duplicates the pinout and function of the 52kHz LM2576. The higher switching frequency may allow up to a 2:1 reduction in output filter inductor size. The MIC4576 is available in 3.3V, and 5V fixed output ver- sions or a 1.23V to 33V adjustable output version. Both versions are capable of driving a 3A load with excellent line and load regulation. The feedback voltage is guaranteed to ±2% tolerance for adjustable versions, and the output voltage is guaranteed to ±3% forfixed versions,within specifiedvoltagesand loadcon- ditions. The oscillator frequency is guaranteed to ±10%. In shutdown mode, the regulator draws less than 200µA standby current. The regulator performs cycle-by-cycle current limiting and thermal shutdown for protection under fault conditions. This series of simple switch-mode regulators requires a mini- mum number of external components and can operate using a standard series of inductors. Frequency compensation is provided internally. The MIC4576 is available in TO-220 (T) and TO-263 (U) packages for the industrial temperature range. Typical Applications C1 470µF 63V D1 MBR360 C2 1000µF 16V L1 33µH GND FB SW MIC4576-5.0WT SHDN 8V to 36V 5V/3A VIN 3 4 2 5 1 Shutdown Enable Fixed Regulator C1 470µF 63V MBR360 C2 1000µF 16V L1 68µH GND FB SW MIC4576WT SHDN 16V to 36V 12V/3A VIN R2 13.0k 1% R1 1.50k 1% 5 1 4 2 3 Shutdown Enable Adjustable Regulator Features • Fixed 200kHz operation • 3.3V, 5V, and adjustable output versions • Voltage over specified line and load conditions: Fixed version: ±3% max. output voltage Adjustable version: ±2% max. feedback voltage • Guaranteed 3A switch current • Wide 4V to 36V input voltage range • Wide 1.23V to 33V output voltage range • Requires minimum external components • < 200µA typical shutdown mode • 75% efficiency (adjustable version > 75% typical) • Standard inductors are 25% of typical LM2576 values • Thermal shutdown • Overcurrent protection • 100% electrical thermal limit burn-in Applications • Simple high-efficiency step-down (buck) regulator • Efficient preregulator for linear regulators • On-card switching regulators • Positive-to-negative converter (inverting buck-boost) • Battery Charger • Negative boost converter • Step-down to 3.3V for Intel Pentium™ and similar microprocessors Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com |
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